/usr/share/vtk/VolumeRendering/ is in vtk-examples 5.8.0-14.1ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/vtk/VolumeRendering/Cxx/
/usr/share/vtk/VolumeRendering/Cxx/CMakeLists.txt
/usr/share/vtk/VolumeRendering/Cxx/FixedPointVolumeRayCastMapperCT.cxx
/usr/share/vtk/VolumeRendering/Cxx/GPURenderDemo.cxx
/usr/share/vtk/VolumeRendering/Python/
/usr/share/vtk/VolumeRendering/Python/PseudoVolumeRendering.py
/usr/share/vtk/VolumeRendering/Python/SimpleRayCast.py
/usr/share/vtk/VolumeRendering/Python/SimpleTextureMap2D.py
/usr/share/vtk/VolumeRendering/Python/VolumePicker.py
/usr/share/vtk/VolumeRendering/Tcl/
/usr/share/vtk/VolumeRendering/Tcl/IntermixedUnstructuredGrid.tcl
/usr/share/vtk/VolumeRendering/Tcl/PseudoVolumeRendering.tcl
/usr/share/vtk/VolumeRendering/Tcl/SimpleRayCast.tcl
/usr/share/vtk/VolumeRendering/Tcl/SimpleTextureMap2D.tcl
/usr/share/vtk/VolumeRendering/Tcl/volSimpleLOD.tcl